Gmail can read your emails and attachments to train its AI, unless you opt out
(www.malwarebytes.com)
Abbreviated version from article:
How to opt out
Opting out requires you to change settings in two places.
To fully opt out, you must turn off Gmail’s “Smart features” in two separate locations in your settings.
Step 1: Turn off Smart Features in Gmail, Chat, and Meet settings
Step 2: Turn off Google Workspace Smart Features